<style lang="scss" scoped>
  .headerWrapper {
    height: 80px;
  }

  .header {
    height: 80px;
    background-color: #fff;
    color: #fff;
    top: 0;
    left: 0;
    width: 100%;
    line-height: 80px;
    z-index: 100;
    position: relative;

    .container {
      height: 100%;
      box-sizing: border-box;
      border-bottom: 1px solid #DCDFE6;
    }

    .nav-lang-spe {
      color: #888;
    }

    h1 {
      margin: 0;
      float: left;
      font-size: 32px;
      font-weight: normal;

      a {
        color: #409EFF;
        text-decoration: none;
        display: block;
      }

      span {
        font-size: 12px;
        display: inline-block;
        width: 34px;
        height: 18px;
        border: 1px solid rgba(255, 255, 255, .5);
        text-align: center;
        line-height: 18px;
        vertical-align: middle;
        margin-left: 10px;
        border-radius: 3px;
      }
    }

    .nav {
      float: right;
      height: 100%;
      line-height: 80px;
      background: transparent;
      padding: 0;
      margin: 0;
      &::before, &::after {
        display: table;
        content: "";
      }
      &::after {
        clear: both;
      }
    }
    .github {
      float: right;
      line-height: 90px;
    }
    .nav-gap {
      position: relative;
      width: 1px;
      height: 80px;
      padding: 0 20px;

      &::before {
        content: '';
        position: absolute;
        top: calc(50% - 8px);
        width: 1px;
        height: 16px;
        background: #ebebeb;
      }
    }

    .nav-logo,
    .nav-logo-small {
      vertical-align: sub;
    }

    .nav-logo-small {
      display: none;
    }

    .nav-item {
      margin: 0;
      float: left;
      list-style: none;
      position: relative;
      cursor: pointer;

      &.nav-algolia-search {
        cursor: default;
      }

      &.lang-item,
      &:last-child {
        cursor: default;

        span {
          opacity: .8;
        }

        .nav-lang {
          cursor: pointer;
          display: inline-block;
          height: 100%;
          color: #888;

          &:hover {
            color: #409EFF;
          }
          &.active {
             font-weight: bold;
             color: #409EFF;
           }
        }
      }

      a {
        text-decoration: none;
        color: #1989FA;
        opacity: 0.5;
        display: block;
        padding: 0 22px;

        &.active,
        &:hover {
          opacity: 1;
        }

        &.active::after {
          content: '';
          display: inline-block;
          position: absolute;
          bottom: 0;
          left: calc(50% - 15px);
          width: 30px;
          height: 2px;
          background: #409EFF;
        }
      }
    }
  }

  .nav-dropdown {
    margin-bottom: 6px;
    width: 100%;

    span {
      display: block;
      width: 100%;
      font-size: 16px;
      color: #888;
      line-height: 40px;
      transition: .2s;
      padding-bottom: 6px;
      user-select: none;

      &:hover {
         cursor: pointer;
       }
    }

    i {
      transition: .2s;
      font-size: 12px;
      color: #979797;
      transform: translateY(-2px);
    }

    .is-active {
      span, i {
        color: #409EFF;
      }
      i {
        transform: rotateZ(180deg) translateY(3px);
      }
    }

    &:hover {
      span, i {
        color: #409EFF;
      }
    }
  }

  .nav-dropdown-list {
    width: auto;
  }

  @media (max-width: 850px) {
    .header {
      .nav-logo {
        display: none;
      }
      .nav-logo-small {
        display: inline-block;
      }
      .nav-item {
        margin-left: 6px;

        &.lang-item,
        &:last-child {
          margin-left: 10px;
        }

        a {
          padding: 0 5px;
        }
      }
      .nav-theme-switch, .nav-algolia-search {
        display: none;
      }
    }
  }

  @media (max-width: 700px) {
    .header {
      .container {
        padding: 0 12px;
      }
      .nav-item {
        a {
          font-size: 12px;
          vertical-align: top;
        }

        &.lang-item {
          height: 100%;

          .nav-lang {
            display: flex;
            align-items: center;

            span {
              padding-bottom: 0;
            }
          }
        }
      }
      .nav-dropdown {
        padding: 0;
        span {
          font-size: 12px;
        }
      }
      .nav-gap {
        padding: 0 8px;
      }
      .nav-versions {
        display: none;
      }
    }
  }
</style>
<template>
  <div class="headerWrapper">
    <header class="header" ref="header">
      <div class="container">
        <h1><router-link :to="`/${ lang }`">layui-soul-table</router-link></h1>
        <!-- nav -->
        <ul class="nav">
          <!-- gap -->
          <li class="nav-item" v-show="isComponentPage">
            <div class="nav-gap"></div>
          </li>

          <li class="nav-item" v-show="isComponentPage">
            <el-button type="primary" @click="runjs">在线运行</el-button>
          </li>
          <!-- gap -->
          <li class="nav-item" v-show="isComponentPage">
            <div class="nav-gap"></div>
          </li>

          <!-- 语言选择器 -->
          <li class="nav-item lang-item">
            <el-dropdown
              trigger="click"
              class="nav-dropdown nav-lang"
              :class="{ 'is-active': langDropdownVisible }">
              <span>
                {{ displayedLang }}
                <i class="el-icon-arrow-down el-icon--right"></i>
              </span>
              <el-dropdown-menu
                slot="dropdown"
                class="nav-dropdown-list"
                @input="handleLangDropdownToggle">
                <el-dropdown-item
                  v-for="(value, key) in langs"
                  :key="key"
                  @click.native="switchLang(key)">
                  {{ value }}
                </el-dropdown-item>
              </el-dropdown-menu>
            </el-dropdown>
          </li>

        </ul>
      </div>
    </header>
  </div>
</template>
<script>
import compoLang from '../i18n/component.json'


export default {
  data () {
    return {
      active: '',
      // versions: [],
      // version: '1.2.9',
      verDropdownVisible: true,
      langDropdownVisible: true,
      langs: {
        'zh-CN': '中文',
        'en-US': 'English'
      }
    }
  },

  computed: {
    lang () {
      return this.$route.path.split('/')[1] || 'zh-CN'
    },
    displayedLang () {
      return this.langs[this.lang] || '中文'
    },
    langConfig () {
      return compoLang.filter(config => config.lang === this.lang)[0]['header']
    },
    isComponentPage () {
      return /^component/.test(this.$route.name)
    }
  },
  mounted () {
  },
  methods: {
    // switchVersion (version) {
    //   if (version === this.version) return
    //   location.href = `${location.origin}/${this.versions[version]}/${location.hash} `
    // },

    switchLang (targetLang) {
      if (this.lang === targetLang) return
      localStorage.setItem('ELEMENT_LANGUAGE', targetLang)
      this.$router.push(this.$route.path.replace(this.lang, targetLang))
    },

    handleVerDropdownToggle (visible) {
      this.verDropdownVisible = visible
    },

    handleLangDropdownToggle (visible) {
      this.langDropdownVisible = visible
    },
    runjs () {
      window.showRunJs()
    }
  },

  created () {
    // const xhr = new XMLHttpRequest()
    // xhr.onreadystatechange = _ => {
    //   if (xhr.readyState === 4 && xhr.status === 200) {
    //     const versions = JSON.parse(xhr.responseText)
    //     this.versions = Object.keys(versions).reduce((prev, next) => {
    //       prev[next] = versions[next]
    //       return prev
    //     }, {})
    //   }
    // }
    // xhr.open('GET', '/versions.json')
    // xhr.send()
  }
}
</script>
